Cut-off for natural-gas pipes



(N0 Mddel.) I G. RUSSELL. GUT-OFF FOR NATURAL GAS PIPES. ,No. 340,524. Patented Apr. 20, 1886.

WITNESSES.-

'UNlTE STAT S GEORGE RUSSELL, OF MOKEESPORT, PENNSYLVANIA.

CUT-OFF FOR NATURAL-GAS PIPES.

SPEOIFICATIONiorming part of Letters Patent No. 340,524, dated April 20, 1886.

Application filed February '23, 1886. Serial No. 192,898. (No model.)

To all whom it may concern;

Be it known that I, GEORGE RUSSELL, a citizen of the United States, residing at McKeesport, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Gut-Offs for Natural Gas Pipes; andI do hereby declare the following to be a full, clear, and exact description of the invention.

My present invention has relation to certain improvements in cut-off valves for natural gas, and especially to improvements upon the subject of Letters Patent No. 337,350, granted to me the 2d day of March, A. D. 1886. In the device covered by said Letters Patent the valve chamber or chest is the medium or channel through which the gas passes by way of the valve opening or port to the service pipe or branch. The gas, th ere'fore, in being conveyed to the point of consumption, passes behind the cut-off valve, and should there be any back-- pressure the same will be exerted on the back of the valve,and may have a tendency to close the latter.

My present improvement has for its object the provision of means for preventing the admission of the gas behind the valve; and accordingly it consists in the combination, with the valve-chest, the valve, and its appurtenances,of a laterally-arranged port communicating with the service-pipe and located adjacent to the valve, so as to be opened and closed thereby.

, Referring to the accompanying drawing, the figure is alongitudinal sectional view of a portion of a supply-pipe having my automatic cut-off valve and locking device in their proper positions therein.

In said drawing, A designates the valvechamber, which consists of a metallic casing of any suitable length and width, and of approximately the same capacity of the servicepipe, to which it is to be connected.

\Vithin the chamber A are two partitions, B G, havingopenings b c, for the passage of the valve-stem D. The partition Bis placed near one end of the chamber, and the partition 0 at about the center of the chamber, as clearly shown in the drawing.

The valve proper consists of the piston-head E, having stem D, so constructed as to freely move in the chest F. At one side of the chest F is a port, G, which leads into the servicepipe the open end H of the chest being connected to the main supply-pipe. A collar, d, is firmly attached to the stem D at a sufficient distance from the partition 0 so as to allow the valve to be moved within the chest F. Abutting against this collar and surrounding the stem D is a spiral spring, I, the other end of which rests against or is fastened to the partition B. The tendency of this spring is to force the pistonhead toward the open mouth H of the valve-chest, and thus close the port G. At the opposite end of the chamber and outside the partition Bis placed a gravity stop or gate,K, having suitable hearings or channels, is k, and provided with a hand-piece or rod, Z, and chain m. As will be seen, the end of the stem D passes through the partition B, and extends, when the service-pipe is open, under the gravity lock or gate K, holding it in an elevated position. The lock or catch, as arranged, is free to drop when the valve closes under such conditions as require the flow of the gas to be stopped. Vhen it is desired to reopen the valve, the rod (1 is drawn upward and is followed by the block, which is raised through the medium of the chain or cord. As soon as the block is high enough to allow the valvestem to pass under it, the rod Z is lowered, the chain or cord then becoming slack, so as to impose no strain upon the block, but allow it perfect freedom of motion and liberty to drop when the valve is closed.

The valve-head E is of sufficient width and is so arranged within the chest as to entirely cover and close the port G, so that no gas will escape around said head and get between it and the partition C. This construction is very necessary, for the reason that if gas be allowed to get behind the piston-head E it will accumulate between the valve and'partition O, and a back-pressure will be produced which will be sufficient to overcome the pressure of the flowing gas, and thus close the port G.

Having described my invention, I claim 1. The combination, in a cut-oil for gas-sup- 5 ply pipes, comprising a valve-chest, a stemvalve arranged to move lengthwise thereof, an

adjusting or closing spring attached to the valve-stem, and a gravity block or catch constructed and arranged as described, of a serv- I0 ice-pipe communicating with said valve-chest by a port in the side thereof, said port being opened and closed by the valve, as set forth.

2. In a'cut-off device for gas-supply pipes,

the combination, with the valve-chest and a 15 longitndinally-moving stem-valve adapted to open and close the outlet from said chest, of

the partition 0, designed and adapted to prevent the accumulation ofgas behind said valvehead, and a lateral port communicating with 20 the valve-chest near the valve and forward of said partition, substantially as shown and described.

3. In a cut-off device for gassupply pipes, comprising a valve-chest having a lateral port opening in front of the valve,a stern valve ar- 25 ranged to move lengthwise thereof. an adj usting or closing spring, and a gravity block or catch, the partition 0, arranged substantially as shown and described, whereby, when the valve is open, said partition will serve as a seat for the valve-head E, and thereby prevent the accumulation of' gas behind said head, as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 20th day of 5 February, 1886.

GEORGE RUSSELL.

Witnesses:

THos. A. CONNOLLY, J 0s. B. CONNOLLY. 

